During the numerical reconstruction process of synthetic aperture hologram by use of screen-division method,the center change of the digital reconstruction plane will influence the positions and the phase distributions of the corresponding reconstructed images from the sub-holograms,which will affect the quality of the synthetic numerical reconstruction image. For synthetic aperture digital lensless Fourier transform hologram,a screen-division reconstruction method is proposed based on theoretical analysis. It is pointed out that,in order to get the accurate synthetic numerical reconstruction image,the sub-reconstructed images should multiply with the phase correction factor according to the position of the corresponding sub-holograms on the synthetic aperture hologram plane and then be superposed. Taking the digital lensless Fourier transform hologram with large area acquired by use of linear CCD push-broom technology as example,the screen-division numerical reconstruction experiment is conducted according to the proposed method,and accurate synthetic numerical reconstruction image with high quality is acquired. The experimental result is consistent with the theoretical analysis.